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Single vs. Dual Magnetos for Piston Engines

Ignition coils are an essential component for nearly all engine types, providing the necessary voltage to ignite the spark plugs and ensure proper engine operation. Without them, generating the high voltage required for spark plugs would be impossible. In certain engine applications, ignition coils are designed to ensure enhanced safety, redundancy, and reliability – magnetos.

Magnetos are a specific type of self-contained ignition coil assembly that operates independently to provide consistent voltage to spark plugs without relying on external power sources. This makes magnetos particularly useful for applications where reliability is critical. Magnetos come in different configurations, and this article compares two of the main types, outlining their benefits and drawbacks.

Single Magnetos

Single magnetos are the most basic type of ignition system for certain piston engines. Many engines will use two of these types of systems, with each magneto operating independently. Each system is connected to its own spark plug and cylinder, and both work simultaneously to fire the cylinders. The independence of each magneto ensures reliable performance – if one fails, the other continues to function, providing redundancy. This setup also promotes efficient combustion of the fuel mixture within the cylinder, aiding in better fuel efficiency.

Dual Magnetos

Dual magnetos are a type of ignition system where both the ignition coils for an engine are housed in a single casing. While the coils function similarly to separate systems, they are powered by the same magnet rotor and engine drive. This design helps reduce weight and space requirements within the engine assembly, making maintenance simpler, as both coils are in one location. However, one drawback of dual magnetos is the possibility of both ignition coils failing if the rotor is damaged. 

About Custom Magnetics, Inc.

Custom Magnetics, Inc. is a leading manufacturer of custom-designed transformers and coils for a wide variety of applications. We provide tailored magnetics solutions to clients in audio production and recording equipment, aerospace manufacturing, industrial controls, telecommunications, lighting systems, transducers, and much more. Visit our website to learn more about how we can support your ignition system and ignition coil needs.